Driving is a portal into general life functioning, and impaired driving skill can pose a serious threat to the combat veterans (CV), passengers and others; and involves increased risk of subsequent injuries, medical expenses and legal sequelae. Motor vehicle crashes (MVC) among post deployed CV are one of the top four causes of injury and disability, hospitalization, and outpatient visits across the military, and are a leading cause of death among Army service members. The risk of motor vehicle (MV) death is significantly increased in years immediately following return from the battlefield. In sum, the effects of Traumatic Brain Injury (TBI)/ Post Traumatic Stress Disorder (PTSD) and other blast related injuries, combined with the "battlefield" mindset and lack of community reintegration programs place CV at risk for MVC and fatalities. On-road assessments, the gold standard, presents a risk for crash or adverse advents in this population of CV. Alternately, simulated driving evaluation measures driving performance in a safe, accurate and objective manner with evidence of absolute and relative validity when compared to real world (on-road) driving. Knowing participants can or cannot safely resume driving, and providing rehabilitation for those with a potential for resuming safe driving could result in: increased safe driving behaviors; avoidance of injuries, collisions, citations and participants residua; and resuming safe driving with its attendant benefits in the realms of family functioning, participation in society and satisfaction with life. The overarching objective of this proposal is to discern, after clinical and simulated driving performance testing , if Occupational Therapy Driving Intervention (OT-DI) can improve the safe driving performance (less errors) over the short term (immediately following intervention) and intermediate term (3 months).